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EP0031156B1 - Four de cuisine avec détecteur d'humidité en céramique - Google Patents

Four de cuisine avec détecteur d'humidité en céramique Download PDF

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Publication number
EP0031156B1
EP0031156B1 EP80108055A EP80108055A EP0031156B1 EP 0031156 B1 EP0031156 B1 EP 0031156B1 EP 80108055 A EP80108055 A EP 80108055A EP 80108055 A EP80108055 A EP 80108055A EP 0031156 B1 EP0031156 B1 EP 0031156B1
Authority
EP
European Patent Office
Prior art keywords
sensor
ceramic
heating
oven
oven chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80108055A
Other languages
German (de)
English (en)
Other versions
EP0031156A1 (fr
Inventor
Takashi Niwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0031156A1 publication Critical patent/EP0031156A1/fr
Application granted granted Critical
Publication of EP0031156B1 publication Critical patent/EP0031156B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/642—Cooling of the microwave components and related air circulation systems
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/645—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using temperature sensors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/6458—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using humidity or vapor sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S99/00—Foods and beverages: apparatus
    • Y10S99/14—Induction heating

Definitions

  • This invention relates to a cooking oven with a ceramic humidity sensor comprising a casing, an oven chamber accommodating food to be cooked, a microwave generator supplying microwave energy toward and into said oven chamber accommodating the food therein, an air guide accommodating said sensor and guiding air from within said oven chamber toward the exterior of said casing, sensor-heating means for heating the surface of said sensor, and a control circuit controlling the operation of said microwave generator in response to the output signal from said sensor.
  • the ceramic sensor used in a known cooking oven of the above referenced type is a unifunctional one since it is only designed for sensing the relative humidity of air in the oven chamber. Heating of the surface of the ceramic humidity sensor by the sensor heating means is only made for the purpose of burning out contaminants accumulating on the surface of the sensor and thereby preventing deterioration of its sensitivity.
  • this unifunctional sensor apart from detecting vapor has not been capable of sensing other components such as soot and volatile matters of very small amounts. Information on such components should, however, be sensed for the attainment of successful cooking.
  • This object is attained by switching means for changing the surface temperature of said sensor by changing over the heating temperature level of said sensor-heating means in order to change the sensing characteristic of said sensor between sensitivity of humidity and sensitivity of soot in response to a control signal applied from said control circuit, and a heater element selectively controlled by said control circuit in response to the output signal from said sensor for hot air heating of the food placed in said oven chamber.
  • the sensing part of the sensor is heated at one of temperature levels depending on the cooking information to be sensed by the sensor.
  • the sensing part may be heated at a low temperature level to prevent dewing thereon when a change in the relative humidity of air in the oven chamber due to vapor given off from a foodstuff is to be sensed, while it is heated up to a relatively high but stable temperature level when the soot given off from the foodstuff is to be sensed.
  • control circuit includes a plurality of amplifiers having different gains for amplifying the output signal from the ceramic sensor.
  • the microwave energy generated by a magnetron 1 is guided by a wave guide 2 to be directed toward and into an oven chamber 3 of a microwave oven and is absorbed by materials placed in the oven chamber 3 to be cooked by the microwave energy.
  • An air stream produced by a cooling fan 4 provided for cooling the magnetron 1 passes through a punched portion 5 of one of the side walls of the oven chamber 3 to flow into the oven chamber 3. Then, the air stream passes through a punched portion 6 of the other side wall of the oven chamber 3 to flow out from the oven chamber 3 and is guided by an exhaust guide 7 to be discharged to the exterior of the casing 8 of the microwave oven.
  • a sensor 9 as shown in Fig.
  • An electronic circuit 10 is installed in the casing 8 of the microwave oven so as to control all the functions of the microwave oven on the basis of cooking parameter information sensed by the ceramic sensor 9.
  • a plurality of punchings 10a are provided in the rear wall of the oven chamber 3 so that heat generated by a heater element 11 can be transmitted into the oven chamber 3 through the punchings 10a by the rotation of a fan 12 which directs a stream of hot air.
  • the metal-oxide ceramic composition employed in the present invention is a sintered porous ceramic mixture of MgCr 2 0 4 (magnesium chromate) and Tio 2 (titanium oxide).
  • a heater 14 is associated with the sensing part 13 to apply heat to the sensing part 13 to burn out contaminants accumulating on or adhering to the surface of the sensing part 13 thereby keeping clean the surface of the sensing part 13, so that the ceramic sensor 9 can fully exhibit its performance even under a severe operating condition in which it may be exposed to oil vapor and other organic vapor given off from a foodstuff being cooked on it may be subject to dewing during cooking.
  • This ceramic sensor 9 shows its sensitivity to a change in the relative humidity from 0% to 100% as shown in Fig. 7, and the resistance of its sensing part 13 changes over a considerably wide range of from about 1019 to about 1010 as shown by the curve in Fig. 7. Therefore, in order to transduce the resistance changing over such a wide range into an output voltage changing correspondingly, an amplifier providing such an output voltage which changes generally smoothly all over the changeable resistance range as shown by the solid curve in Fig. 8, is essentially required.
  • the dotted curve represents the soot sensing characteristic.
  • the dotted curve in Fig. 9 shows a resistance change in the sensing part 13 relative to the temperature when the ceramic sensor 9 is exposed to air containing soot.
  • the solid curve in Fig. 9 represents the temperature vs. resistance characteristic of the ceramic sensor 9 when it is exposed to soot-free air.
  • Fig. 9 shows that, when soot is present in the ambient air, the sensing part 13 of the ceramic sensor 9 senses volatile matters such as hydrocarbons and aldehydes of very small amounts contained in the soot, and the resistance of the sensing part 13 becomes higher than when such matters are not present. The higher the temperature, the more is the rate of change of the resistance of the sensing part 13.
  • This rate 3R of change of the resistance of the sensing part 13 is such that the resistance value changes from about 10 4 Q to about 105 Q in the vicinity of 450°C and is thus very small compared with that observed when the relative humidity of air or the content of water vapor in air changes from 0% to 100%. Therefore, another amplifier used in the soot sensing operation need not exhibit its amplification performance over a wide resistance range unlike that used in the humidity sensing operation, but it is required to provide a large gain in a resistance range of from about 10 4 Q to about 10 6 S2.
  • the level of the voltage applied across the heater 14 during the humidity sensing operation is also selected to differ from that applied across the heater 14 during the soot sensing operation.
  • the level of the voltage applied across the heater 14 to heat the sensing part 13 is such that the temperature of the heated sensing part 13 is higher by about 5°C than room temperature so that the sensing part 13 may not be subject to dewing thereby preventing or avoiding degradation of the humidity sensing characteristic.
  • the soot sensing operation it is necessary to heat the sensing part 13 up to about 450°C at which the ceramic sensor 9 shows its high sensitivity to soot.
  • Fig. 10 is a sketch of the structure of the electronic circuit 10.
  • the circuit 10 acts as a humidity sensing circuit when a switch 15 is switched to the position connecting the sensor 9 to an amplifier 16 participating in the humidity sensing operation, and another switch 17 is switched to the position connecting the heater 14 to a low-voltage source 18 which supplies power of low level consumed by the heater 14 to avoid dewing.
  • the circuit 10 functions as a soot sensing circuit when the switch 15 is switched to the position connecting the sensor 9 to another amplifier 19 participating in the soot sensing operation, and the switch 17 is switched to the position connecting the heater 14 to a high- voltage source 20 which supplies power of high level consumed by the heater 14.
  • the output voltage generated from each of these amplifiers 16 and 19 is compared in a comparator 21 with an output voltage generated from a reference voltage generator 22, and the resultant output voltage appears from the comparator 21.
  • the present level of the output voltage or the resistance value of the sensing part 13 of the ceramic sensor 9 can be detected.
  • Fig. 11 is a circuit diagram of the voltage source for the heater 14.
  • a switch 23 When a switch 23 is switched to the position N.O. and another switch 24 is closed, the secondary voltage of a transformer 25 is applied across the heater 14, and the heater 14 heats the sensing part 13 of the ceramic sensor 9 up to a temperature higher than about 500°C to burn out contaminants such as oil vapor and dust accumulating on or adhering to the surface of the sensing part 13.
  • This is the so-called refreshing operation which is necessarily carried out prior to cooking so as to prevent or avoid degradation of the sensitivity of the sensor 9.
  • the switch 24 when the switch 24 is opened with the switch 23 maintained in the position N.O., the voltage obtained by dividing the secondary voltage of the transformer 25 by a resistor 26 and the resistance of the heater 14 is applied across the heater 14, and the heater 14 warms up the sensing part 13 of the ceramic sensor 9 to avoid dewing on the sensor 9 making the humidity sensing operation.
  • the switch 23 is then switched to the position N.C., the secondary AC voltage of the transformer 25 is applied across the heater 14 after being converted into a stabilized direct current voltage by a stabilized direct current voltage supply circuit 25-a, and the heater 14 heats the sensing part 13 of the ceramic sensor 9 up to about 450°C.
  • Such a power supply system is thus effective in stabilizing the soot sensing characteristic of the ceramic sensor 9 regardless of variations of the power supply voltage.
  • Fig. 12 is a circuit diagram of the electronic circuit 10 when the ceramic sensor 9 is making the humidity sensing operation.
  • the circuit includes capacitors 13-a and 13-b which are provided so that direct current components, which may be superposed on the pulse input or signal and applied to the sensing part 13 of the ceramic sensor 9, may not cause electrolysis of the metal-oxide ceramic composition resulting in degradation of the sensitivity of the sensor 9.
  • the signal voltage divided by the resistance of the sensing part 13 and a resistor 27 is applied to a first operational amplifier 14-a in which the signal voltage is amplified by the factor determined by the ratio between the resistance values of resistors 14-c and 14-d and has its phase inverted.
  • the output voltage of the first operational amplifier 14-a is then amplified by a second operational amplifier 14-b by the factor determined by the ratio between the resistance values of a resistor 28 and a feedback resistor group 29 and has its phase similarly inverted.
  • the resultant output voltage of the second operational amplifier 14-b is applied as an input to the comparator 21.
  • the signal voltage is applied as one of the inputs to the comparator 21 after being subjected to the two-stage inverting amplification.
  • Diodes 30 and 31 are connected in series with the associated resistors respectively in the feedback resistor group 29 to function as switching diodes.
  • These switching diodes act to suitably change over the resistance of the feedback resistor group 29 depending on the level of the amplifier output voltage so that the amplifier output voltage can make a generally smooth change during a change of the resistance of the sensing part 13 of the ceramic sensor 9 between about 10 k ⁇ and about 1C ⁇ M ⁇ .
  • Fig. 13 shows the time-depending change of the input voltage applied to the comparator 21.
  • the comparator input voltage increases due to the fact that the temperature of the sensing part 13 rises owing to the refreshing operation and the resistance value of the sensing part 13 becomes small.
  • the voltage source for the heater 14 is switched over so that it serves the dewing preventive function.
  • the resistance value of the sensing part 13 becomes large and the comparator input voltage decreases.
  • the sensing part 13 is sufficiently cooled by the air stream to show the humidity sensing characteristic, and the comparator input voltage increases again.
  • Cooking is continued in such a condition resulting in a rise of the temperature of the air in the oven chamber 3 and in a decrease of the relative humidity of the air in the oven chamber.
  • the resistance value of the sensing part 13 of the ceramic sensor 9 becomes gradually large, and the comparator input voltage decreases gradually.
  • the comparator input voltage starts to increase again.
  • the increment ⁇ V of the comparator input voltage from its lowest level in the range (E) is detected so as to control the cooking operation.
  • Fig. 14 is a circuit diagram of the electronic circuit 10 when the ceramic sensor 9 is making the soot sensing operation.
  • the amplification characteristic of the amplifiers in this circuit is as represented by the dotted curve in Fig. 8.
  • Fig. 15 shows the time-depending change of the comparator input voltage when the ceramic sensor 9 is making the soot sensing operation.
  • the comparator input voltage increases because of the refreshing operation.
  • the voltage source for the heater 14 is switched over to carry out the heating function for heating the sensing part 13 up to about 450°C.
  • the resistance value of the sensing part 13 becomes gradually large as the ceramic sensor 9 is exposed to soot containing volatile matters such as hydrocarbons and aldehydes.
  • the comparator input voltage starts to decrease. It is the detection level at which the voltage level is lowered by the decrement ⁇ V from that applied to the heater 14 to start heating of the sensing part 13 up to about 450°C.
  • Fig. 16 is a circuit diagram of one form of the microwave oven control circuit including a microcomputer 31-a as a control means.
  • a start button 32 Upon depression of a start button 32 (Fig. 4), a start switch 33 is closed to close a contact 34-a and open a contact 34-b of a semiconductor switch 34, and an amplifier 35 for the humidity sensing purpose is selected, while, at the same time, a refreshing operation relay 36 is energized.
  • the refreshing operation relay 36 is deenergized to change over the voltage applied across the heater 14.
  • the start button 32 is depressed after depression of a grill key 37 (Fig.
  • the power supply voltage is applied across the primary side of a high- voltage transformer 45 to induce a high voltage in the secondary side of the transformer 45 thereby causing oscillation of the magnetron 1.
  • the microcomputer 31-a detects or calculates ⁇ V in Fig. 13 on the basis of the information including the output voltage of a comparator 47 and the reference voltage applied to the comparator 47 and finally deenergizes the relay 44 to end the cooking operation.
  • the coil of a relay 48 is energized to energize the heater 11 disposed outside of the oven chamber 3.
  • the microcomputer 31-a detects or calculates ⁇ V in Fig. 15 on the basis of the information including the output voltage of the comparator 47 and the reference voltage applied to the comparator 47 and finally deenergizes the relay 48 to end the cooking operation.
  • Fig. 17 shows a partial modification of the circuit shown in Fig. 16.
  • a pair of switches 47-a and 47-b are provided for switching over the resistors in the feedback resistance group 29 associated with the operational amplifier 14-b.
  • the operational amplifier 14-b functions as a humidity sensing purpose amplifier when the switch 47-a is closed and the switch 47-b is opened, and as a soot sensing purpose amplifier when the switch 47-a is opened and the switch 47-b is closed.
  • Fig. 18 is a flow chart showing the aforementioned steps of cooking carried out under control of the microcomputer 31-a.
  • Fig. 19 shows a modification of the ceramic sensor 9 shown in Fig. 5.
  • the coil heater 14 is replaced by a plane one 48', and such a plane heater 48' is mounted on the surface of the sensing part 13 of the ceramic sensor 9.
  • the present invention comprises a ceramic sensor, means for changing the level of heat applied to the sensing part of the ceramic sensor, and amplifiers having different gains.
  • the single sensor can sense both of a change in the relative humidity of air in the oven chamber due to vapor given off from materials being cooked and volatile matters contained in soot given off from the materials being cooked.
  • the present invention is therefore advantageous in that the state of cooking a "grill menu", which could not be sensed by resorting only to the humidity sensing characteristic of a prior art unifunctional sensor, can be automatically sensed so that the microwave oven can be used for the cooking of a variety of menus.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Claims (3)

1. Four de cuisine avec détecteur d'humidité en céramique (9), comprenant une enveloppe (8), un compartiment de cuisson (3) dans lequel est placé l'aliment à cuire, un générateur d'hyperfréquences (1) fournissant de l'énergie micro-ondes en direction et à l'intérieur du compartiment de cuisson qui contient l'aliment, un guide d'air (7) qui loge le détecteur (9) et guide l'air depuis l'intérieur du compartiment de cuisson vers l'extérieur de l'enveloppe, des moyens (14) de chauffage du détecteur pour chauffer la surface du détecteur (9) et un circuit de commande (10) qui régit le fonctionnement du générateur d'hyperfréquences (1) en réponse au signal de sortie du détecteur (9), caractérisé par des moyens de commutation (17) pour faire varier la température de la surface du détecteur (9) en commutant le niveau de température de chauffage des moyens (14) de chauffage du détecteur, afin de faire passer la caractéristique de détection du détecteur (9) de la sensibilité à l'humidité à la sensibilité à la suie et vice-versa en réponse à un signal de commande reçu du circuit de commande (10), et par un élément chauffant (11) qui est commandé sélectivement par le circuit de commande (10), en réponse au signal de sortie du détecteur (9), pour chauffer par air chaud l'aliment placé dans le compartiment de cuisson (3).
2. Four à micro-ondes selon la revendication 1, caractérisé en ce que les moyens chauffants (14) prévus pour chauffer la surface du détecteur en céramique (9) sont raccordés à une source de puissance comprenant une source de courant continu stabilisé (25-a) et une source de courant alternatif (25) qui sont commutées sélectivement par lesdits moyens de commutation.
3. Four à micro-ondes selon la revendication 1, caractérisé en ce que le circuit de commande comprend plusieurs amplificateurs ayant des gains différents, pour amplifier le signal de sortie du détecteur en céramique.
EP80108055A 1979-12-24 1980-12-19 Four de cuisine avec détecteur d'humidité en céramique Expired EP0031156B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP168851/79 1979-12-24
JP16885179A JPS5691716A (en) 1979-12-24 1979-12-24 Automatic electronic range

Publications (2)

Publication Number Publication Date
EP0031156A1 EP0031156A1 (fr) 1981-07-01
EP0031156B1 true EP0031156B1 (fr) 1984-11-21

Family

ID=15875715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80108055A Expired EP0031156B1 (fr) 1979-12-24 1980-12-19 Four de cuisine avec détecteur d'humidité en céramique

Country Status (6)

Country Link
US (1) US4383158A (fr)
EP (1) EP0031156B1 (fr)
JP (1) JPS5691716A (fr)
AU (1) AU526052B2 (fr)
CA (1) CA1149882A (fr)
DE (1) DE3069684D1 (fr)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57119249A (en) * 1981-01-16 1982-07-24 Matsushita Electric Ind Co Ltd Humidity sensor control circuit
CA1199076A (fr) * 1981-07-06 1986-01-07 Takeshi Tanabe Appareil de cuisson a micro-ondes simplifiant le travail de l'utilisateur
JPS5813401U (ja) * 1981-07-20 1983-01-27 シャープ株式会社 調理器
CA1190604A (fr) * 1981-07-21 1985-07-16 Takeshi Tanabe Combinaison de four a micro-ondes et gril avec automatisme regulateur de duree et de degre de cuisson
CA1200289A (fr) * 1981-07-28 1986-02-04 Takeshi Tanabe Cuisiniere a four micro-ondes et gril
JPS5880426A (ja) * 1981-11-06 1983-05-14 Matsushita Electric Ind Co Ltd 高周波加熱装置
JPS5880427A (ja) * 1981-11-06 1983-05-14 Matsushita Electric Ind Co Ltd 高周波加熱装置
US4481404A (en) * 1982-12-22 1984-11-06 General Electric Company Turn-off control circuit for self-cleaning ovens
US4496817A (en) * 1983-07-07 1985-01-29 General Electric Company Automatic fire detection for a microwave oven
JPS60131793A (ja) * 1983-12-20 1985-07-13 松下電器産業株式会社 自動高周波加熱装置
AU551298B2 (en) * 1984-02-07 1986-04-24 Matsushita Electric Industrial Co., Ltd. High frequency heating apparatus
JPS60203811A (ja) * 1984-03-28 1985-10-15 Sharp Corp 検出装置
GB2165948B (en) * 1984-10-23 1988-12-07 Health Lab Service Board Formaldehyde monitor
JPS61143630A (ja) * 1984-12-14 1986-07-01 Sharp Corp 加熱器
JPH0781715B2 (ja) * 1986-12-17 1995-09-06 松下電器産業株式会社 加熱装置
JP2523805B2 (ja) * 1988-08-03 1996-08-14 松下電器産業株式会社 圧電素子センサ付き高周波加熱装置
JPH0820910B2 (ja) * 1988-10-31 1996-03-04 松下電器産業株式会社 圧電素子応用センサ
US4954694A (en) * 1989-01-31 1990-09-04 Matsushita Electric Industrial Co., Ltd. Cooking oven having function to automatically clean soils attached to inner walls thereof
EP0397397B1 (fr) * 1989-05-08 1995-01-11 Matsushita Electric Industrial Co., Ltd. Appareil de chauffage automatique
DE4141768A1 (de) * 1991-12-18 1993-06-24 Miele & Cie Kochherd, insbesondere mikrowellenherd
SE470168B (sv) * 1992-04-27 1993-11-22 Whirlpool Int Rök/ångdetektor för mikrovågsugn
KR960008974B1 (en) * 1993-12-30 1996-07-10 Lg Electronics Inc Auto defrosting apparatus for microwave oven
KR0154643B1 (ko) * 1995-09-29 1998-11-16 배순훈 증기센서의 출력신호를 이용한 적응 제어방법
US11274876B2 (en) 2007-12-28 2022-03-15 Intirion Corporation Multiple linked appliance with auxiliary outlet
CN103733076B (zh) * 2011-05-26 2017-04-12 斯通瑞智公司 烟尘传感器系统
DE102012200304A1 (de) * 2012-01-11 2013-07-11 BSH Bosch und Siemens Hausgeräte GmbH Gargerät mit Sensor für Garraum
ES2858475T3 (es) * 2014-11-07 2021-09-30 Candy Spa Horno de cocción
US10009965B2 (en) 2015-01-28 2018-06-26 Samsung Electronics Co., Ltd. Gas detection apparatus, cooking apparatus, and method of controlling the apparatuses

Citations (1)

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DE2622308A1 (de) * 1975-05-20 1976-12-02 Matsushita Electric Ind Co Ltd Vorrichtung zur regelung der heizdauer durch feuchtigkeitsabfuehlung

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JPS5224770A (en) * 1975-08-20 1977-02-24 Matsushita Electric Ind Co Ltd Cooking oven
US4080564A (en) * 1975-10-02 1978-03-21 Matsushita Electric Industrial Co., Ltd. Humidity sensitive resistor device
JPS55124984A (en) * 1979-03-19 1980-09-26 Sharp Kk Cooking device

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
DE2622308A1 (de) * 1975-05-20 1976-12-02 Matsushita Electric Ind Co Ltd Vorrichtung zur regelung der heizdauer durch feuchtigkeitsabfuehlung

Non-Patent Citations (1)

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Title
Patents Abstracts of Japan, Vol. 3, No. 97, 17 August 1979, page 53M69 *

Also Published As

Publication number Publication date
AU6546480A (en) 1981-07-02
JPS6228554B2 (fr) 1987-06-20
CA1149882A (fr) 1983-07-12
EP0031156A1 (fr) 1981-07-01
JPS5691716A (en) 1981-07-24
AU526052B2 (en) 1982-12-16
DE3069684D1 (en) 1985-01-03
US4383158A (en) 1983-05-10

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